Acoustic Guitar 4 Bands Preamp EQ Pickup C-MIC Blend Tuner+Piezo Transducer 100% brand new and unused and high quality.All the EQs from factory without package and instruction and we sold many years ,if you don't know how to fix it ,plz email us. W/Blue Backlight LCD Screen Tuner 4-band tone controls (BASS, MIDD.L, MIDD.H, TREBLE) for all guitarists looking to improve their sound with MIC Powered by DC 9V Alkaline battery (not included) Bass:  12dB at60HZ , Midd:  12dB at 500KHZ ,Treble:  12dB at3KHZ , Presence:  12dB at 10KHZ 95 x 55 x 35mm